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Possible Duplicate: osx/linux: pipes into two processes? Is there a way to pipe the output from one command into the input of two other commands, running them simultaneously? Something like this: $ echo 'test' |(cat) |(cat) test test The reason I want to do this is that I have a program which receives an FM radio signal from a USB SDR device, and outputs the audio as raw PCM data (like a .wav file but with no header.) Since the signal is not music but POCSAG pager data, I need to pipe it to a decoder program to recover the pager text. However I also want to listen to the signal so I know whether any data is coming in or not. (Otherwise I can't tell if the decoder is broken or there's just no data being broadcast.) So as well as piping the data to the pager decoder, I also need to pipe the same data to the play command. Currently I only know how to do one - either pipe it to the decoder and read the data in silence, or pipe it to play and hear it without seeing any decoded text. How can I pipe the same data to both commands, so I can read the text and hear the audio? I can't use tee as it only writes the duplicated data to a file, but I need to process the data in real-time.

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